/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package com.u6.udp.test;

import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.FixedReceiveBufferSizePredictorFactory;
import org.jboss.netty.channel.socket.DatagramChannel;
import org.jboss.netty.channel.socket.DatagramChannelFactory;
import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;
import org.jboss.netty.util.CharsetUtil;

import com.u6.udp.netty.UdpChannelHandler;
import com.u6.udp.netty.UdpMessage;
import com.u6.udp.netty.UdpMessageEncoder;
import com.u6.udp.netty.UdpProtocolDecoder;
import com.u6.udp.netty.UdpProtocolEncoder;

/**
 * A UDP broadcast client that asks for a quote of the moment (QOTM) to
 * {@link QuoteOfTheMomentServer}.
 * 
 * Inspired by <a href=
 * "http://java.sun.com/docs/books/tutorial/networking/datagrams/clientServer.html"
 * >the official Java tutorial</a>.
 * 
 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
 * @version $Rev: 2104 $, $Date: 2010-01-28 16:50:28 +0900 (Thu, 28 Jan 2010) $
 */
public class QuoteOfTheMomentClient {

	public static void main(String[] args) throws Exception {
		DatagramChannelFactory f = new NioDatagramChannelFactory(Executors.newCachedThreadPool());

		ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);

		// Configure the pipeline factory.
		b.setPipelineFactory(new ChannelPipelineFactory() {
			public ChannelPipeline getPipeline() throws Exception {
				ChannelPipeline pipeline = Channels.pipeline();
				pipeline.addLast("decoder", new UdpProtocolDecoder());
				pipeline.addLast("encoder", new UdpProtocolEncoder());
				pipeline.addLast("handler", new QuoteOfTheMomentClientHandler());
				return pipeline;
			}
		});

		// Enable broadcast
		b.setOption("broadcast", "true");

		// Allow packets as large as up to 1024 bytes (default is 768).
		// You could increase or decrease this value to avoid truncated packets
		// or to improve memory footprint respectively.
		//
		// Please also note that a large UDP packet might be truncated or
		// dropped by your router no matter how you configured this option.
		// In UDP, a packet is truncated or dropped if it is larger than a
		// certain size, depending on router configuration. IPv4 routers
		// truncate and IPv6 routers drop a large packet. That's why it is
		// safe to send small packets in UDP.
		b.setOption("receiveBufferSizePredictorFactory", new FixedReceiveBufferSizePredictorFactory(1024));

		DatagramChannel c = (DatagramChannel) b.bind(new InetSocketAddress(0));

		short messageID = 1;
		short type = 1;
		long sendUid = 12345;
		long receiveUid = 45678;
		int length = 0;
		byte[] data = new byte[0];
		UdpMessage message = new UdpMessage(messageID, type, sendUid, receiveUid, length, data);

		byte[] bs = UdpMessageEncoder.encode(message);

		// Broadcast the QOTM request to port 8080.
		c.write(bs, new InetSocketAddress("255.255.255.255", 8080));

		// QuoteOfTheMomentClientHandler will close the DatagramChannel when a
		// response is received. If the channel is not closed within 5 seconds,
		// print an error message and quit.
		if (!c.getCloseFuture().awaitUninterruptibly(5000)) {
			System.err.println("QOTM request timed out.");
			c.close().awaitUninterruptibly();
		}

		f.releaseExternalResources();
	}
}
